"Right" is the wrong word here. I think it's entirely correct that you have no "right" to clean or safe drinking water.
You have a right to persue that and all your other needs.
And you have a right to tell the government (collectively) to make drinking water a goal, collect taxes to pay for it, and issue mandates to whatever organizations needed to be responsible for making it happen.
Presumably all of that was already in effect since a long time ago, and the problem is various people not doing their jobs in good faith.
Somewhere along the way the people voted for officials who would establish safe municiple water. Somewhere along the way officials set the goals and hired the contractors and set up ongoing operation & maintainance, and that all involved some sort of official mandate with terms and goals written down. And somewhere along the way one or more people are guilty of not performing a duty they were responsible for.
We may not, but we should, have a right to good faith discharge of duties.